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Location of filter system

I am putting in a sprinkler system, i am using 1" poly pip, with 4 zones. So i have a valve box in my back and one in my front yard. My main water line starts in front on the sw corner then to my back yard vales and then to my front yard valves. I ran a 1" poly pip from the beginning of my main water line to my valves in my back yard it's about 75 ft. In what location should i put my filter system, up by where the main line begins or in my back yard where my valves are or up front where the main line begins? If up by my valves in the back yard how far apart should it be from the valve box? How far off the ground should the filter be?

I simply placed my filter inside the same irrigaition box as my backflow preventer. The filter is on the left side of the box, the pipe then makes a U-turn and goes through the backflow preventer on the right side of the box. If you don't have a backflow preventer in a box, you could bury your main shutoff valve and the filter in the same irrigation box.

How would you pit it under ground? You would have to dig a pretty deep whole wouldnt you? How do you flush out the dirt?
Aslo where is the best location for the filter? Can i put my filter at the beginning of my main, then shutoff valve, then quick coupler. Then from there go 75 ft to my manifold valves? Or does the filter have to next to the valves?

I used a wye filter and had no problem installing it inside a valve box.

To install a valve box, you dig a hole the width and length of the valve box and about 4" deeper than the valve box. Place 4" of gravel in the bottom of the hole (keeps burrowing animals from digging into your box, and is a good medium to position the box) and place the box on top of the gravel. Make sure you either close the side holes or place more gravel around them to again keep animals out. Then finish burrying the box so that the lid is at ground level. The pipes can either come through the side holes, you can cut more holes yourself, or the pipe can come up through the gravel into the box.

In my case, PVC pipe came up out of the gravel in one corner, turned 90 degrees and into the wye filter, with the filter element pointing to the center of the box to give me room to remove the filter element, then a 180 degree turn into a backflow preventer, then 90 back down into the gravel. Using a standard rectanguler box, I have room to serivce both the wye filter and the backflow preventer.

Interesting i didnt know you could use the wye filters for you main irriagation system.

How far can my filter be from my valves? Can my filter be by my main water line connection, then run 75 to my back yard valve ir does the filter have to be right next tomy back yard valve? Please answer.